Hi Marc Zyngier

We found the APPS Crash issue on MTBF test. Brief crash information, APPS Crash - Kernel BUG at /sched/walt/sched_avg.c:281! in sched_update_nr_prod flow

[Test equipment] 1. Number of phone: 200 pcs 2. CPU info of phone: CPU architecture with Quad Cortex-A73 and Quad Cortex-A53

[Preset conditions] 1. Android 13 with kernel 5.15 2. Install application of top 20 3. Connected to Wi-Fi 4. Connect the adapter to charge the phone 5. Test duration 48 hours

[Expected results] 0 crash happened.

[Test results without [PATCH] clocksource/drivers/arm_arch_timer: Update sched_clock when non-boot CPUs need counter workaround ] 1. First round of test, found 3 phones with APPS Crash issue on /sched/walt/sched_avg.c:281! in sched_update_nr_prod flow 2. Second round of test, found 7 phones with APP Crash issue on /sched/walt/sched_avg.c:281! in sched_update_nr_prod flow

[Test results with [PATCH] clocksource/drivers/arm_arch_timer: Update sched_clock when non-boot CPUs need counter workaround ] 1. First round of test, 0 crash happened. 2. Second round of test, 0 crash happened.

Tested-by: wangfajie wangfajie@longcheer.com Tested-by: liurenwang liurenwang@longcheer.com Tested-by: zhanghui zhanghui5@longcheer.com Tested-by: liangke liangke1@xiaomi.com

So we think the PATCH is working and it can fix APPS crash issue. Many thanks your time.

Best regards! Wangfajie

-----邮件原件----- 发件人: Marc Zyngier [mailto:maz@kernel.org] 发送时间: 2023年1月19日 17:52 收件人: 刘琦 liuqi405@icloud.com 抄送: daniel.lezcano@kernel.org; linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org; mark.rutland@arm.com; quic_ylal@quicinc.com; stable@vger.kernel.org; will@kernel.org; 王法杰 wangfajie@longcheer.com; 刘仁旺 liurenwang@longcheer.com; 张辉 zhanghui5@longcheer.com; liangke1@xiaomi.com 主题: Re: [PATCH] clocksource/drivers/arm_arch_timer: Update sched_clock when non-boot CPUs need counter workaround

On 2023-01-19 07:59, 刘琦 wrote:

[Test Report] Result: Test Pass

A total of two rounds of pending testing a. The first round of hanging test Number of machines: 200 Hanging test duration: 48h Hanging test results: no walt crash problem b. The second round of hanging test Number of machines: 200 Hanging test duration: 72h Hanging test results: no walt crash problem

Tested-by: wangfajie wangfajie@longcheer.com Tested-by: liurenwang liurenwang@longcheer.com Tested-by: zhanghui zhanghui5@longcheer.com Tested-by: liangke liangke1@xiaomi.com

Thanks for this.

The only issue here is that that you don't explain what you tested, nor how you tested it.

It is also a patch that has known defects (you just have to read the thread for the details)... This makes this testing, no matter how thorough it is, rather ineffective.

M. -- Jazz is not dead. It just smells funny...